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Model specific boards => Golf mk4 => Topic started by: Gareth F on 10 May 2011, 02:09

Title: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 02:09
I know its for a Tdi but some of you petrol guzzlers might know.
Im trying to find a reducer to fit a Milltek tdi decat to my standard system but cant seem to find out which reducer to buy! Does anyone know what the External measurements are of the two pipes im joining? All ive seen is that its milltek 2.5" and standard is 2.25" but dont know if thats internal or external  :undecided:
Title: Re: External bore measurements for milltek decat
Post by: Dave_IOW on 10 May 2011, 07:27
Internal that will be mate
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 08:18
Go to Jetex mate :afro:  I'll try and dig the info out I've got later but I bought my reducer from them
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 08:23
Here you go

http://uk-mkivs.net/forums/t/293940.aspx

Part numbers in that thread :afro:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 10:00
Cheers for the replies  :smiley:

I ordered one off ebay in the end with the following measurements:

External Diameters approx.  - 68mm - 64mm - 60.5mm

Large end I.D.  65mm, small end 57mm

Overall Length approx. 130mm.

Looks like it is too small for what i want :(
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 10:03
You posted at 2.30am and got impatient  :rolleyes: :tongue:

some people...... :laugh: :laugh:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 10:07
You posted at 2.30am and got impatient  :rolleyes: :tongue:

some people...... :laugh: :laugh:

Im like a kid on sweets at christmas!  :laugh:
Just checked you link out (thanks for it btw) but how does a "2.5 sleeve join 2.5" to a 2.25"? Surely one end it way too big  :huh:
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 10:14
Its a reducing sleeve  :wink:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 10:37
Its a reducing sleeve  :wink:

Jetex website isnt exactly great at higlighting that, the info makes it look like a normal straight sleeve with kink bit!
And you say that fits over both ends perfectly?
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 10:44
Its a reducing sleeve  :wink:

Jetex website isnt exactly great at higlighting that, the info makes it look like a normal straight sleeve with kink bit!
And you say that fits over both ends perfectly?

Fitted lovely - the clamps then hold it place  :smiley:  I ended up with a longer sleeve as they didn't have that particular in stock and I needed it next day!  So ended up having to cut approx 1" off the Milltek downpipe

Thought I had pics of it but can't find them now  :undecided:

The easier option would have been to buy the THS downpipe as that comes with adaptors  :smiley:  Didn't know that myself until after I bought the Milltek  :sad:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 10:49
Its a reducing sleeve  :wink:

Jetex website isnt exactly great at higlighting that, the info makes it look like a normal straight sleeve with kink bit!
And you say that fits over both ends perfectly?

Fitted lovely - the clamps then hold it place  :smiley:  I ended up with a longer sleeve as they didn't have that particular in stock and I needed it next day!  So ended up having to cut approx 1" off the Milltek downpipe

Thought I had pics of it but can't find them now  :undecided:

The easier option would have been to buy the THS downpipe as that comes with adaptors  :smiley:  Didn't know that myself until after I bought the Milltek  :sad:


Well ive emailed the company seeing if i can get my money back and buy the other one instead, hope my sob story works on them  :grin:

Dont think i could have got the THS downpipe for £62 though  :tongue:

Also did you fit a TT shifter to your derv? was flicking through some bit on here and it caught my eye and im bored today lol.
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 10:55
Well if you've only paid £62 for it then stick with buying the Jetex adaptor!  Still works out far cheaper :afro:

I did indeed fit one to my derv; not a massive improvement but it did help lose the vagueness you get.  I'm looking for a similar solution for my Aldi
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 11:01
I just hope i get the owl noise  :undecided:

So not really worth the bother to fit one to the derv then?
How is the OOOO going? Not seen it yet.
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 11:03
I just hope i get the owl noise  :undecided:

So not really worth the bother to fit one to the derv then?
How is the OOOO going? Not seen it yet.


Lol I remember Adam being well cheesed off that he didn't get the owl noise on his  :grin: :grin:

For the £20 or so that it is, its worth doing :afro:

You obviously don't get out of this section much  :tongue:
http://www.golfgtiforum.co.uk/index.php?topic=166206.0

I'd skip the first 10 pages or so though  :grin: :grin:  Latest pics are from page 50 or so onwards  :smiley:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 11:11
Tbh i think ill cry if i dont lol.

Ill pop down to vw and see if they have it one the shelf.

I dont leave this section incase i get lost, will take a look now though  :tongue:

Also correctme if im worng but £6.50 postage on the jetex site!!!!
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 11:24
Mine wasn't as loud as Steve's - you can hear his from the next county  :grin: :grin:

Unlikely - most likely have to order you one in  :undecided:

Yeah it wasn't cheap - think it cost me about £30 in total  :sad:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 12:39
Wonder what mines going to be like then, seems like a lucky dip. What were the differences in your cars then?

Hmmm wonder if theres any TT's in a scrap yard somewhere.....

Ive sent Jetex an email about it, the one from ebay has already been sent so ill probs just wait and see!

Nice Audi btw :cool:
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 12:41
Between mine and Adam's?  None in all honesty; we ended up with pretty much the same spec car although his always made that little bit more power and torque

They're only £20 brand new or thereabouts  :wink:

Cheers  :smiley:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 12:49
Hmm funny that, all i know is that mine whistles loudly  :grin:

Got postage for £3.60 from Jetex, nice people  :smiley:

Surely you have guessed im impatient by now, £20 and few days or £10 now  :evil:
Title: Re: External bore measurements for milltek decat
Post by: andc1 on 10 May 2011, 14:44
car looks good gareth! past you in chi by market
Title: Re: External bore measurements for milltek decat
Post by: shady_character19 on 10 May 2011, 19:50
just got a miltek decat for my tdi and glad i found this thread ,been looking for a reducer ! does it come with clamps or do in need to buy them seperate ?
Title: Re: External bore measurements for milltek decat
Post by: Rhyso on 10 May 2011, 20:54
just got a miltek decat for my tdi and glad i found this thread ,been looking for a reducer ! does it come with clamps or do in need to buy them seperate ?


You need to buy the clamps separately; part numbers are on that thread I linked too :afro:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 10 May 2011, 21:02
car looks good gareth! past you in chi by market

Thought it was you (hence the message you will find lol) i was too busy eyeing up your votex splitter to see you put your hand up only when my mate said that bloke just waved at you i was like aahhh it was him.... :grin:
Yours is looking very nice too, im still riding on stilts with kawasaki green calipers and wheel bolt covers  :laugh:

just got a miltek decat for my tdi and glad i found this thread ,been looking for a reducer ! does it come with clamps or do in need to buy them seperate ?


Glad someone benefited from my hours of searching, thank god for Rhyso and his brain (which i hear still runs on derv juice)
You need to buy clamps but ill just pop to my mates and he will fit and throw on some clamps as i will as always conveniently forget to buy some  :evil:

just got a miltek decat for my tdi and glad i found this thread ,been looking for a reducer ! does it come with clamps or do in need to buy them seperate ?


You need to buy the clamps separately; part numbers are on that thread I linked too :afro:

Been a great help Sir  :smiley:
Title: Re: External bore measurements for milltek decat
Post by: Gareth F on 13 May 2011, 23:49
Ok just an update, got the decat fitted but as i assumed the part highlighted in that previously linked thread from Jetex cannot be used to join a 2.5" section to a 2.25" section. So after i wasted £11 on that we ended up using a Universal 3 step reducer i bought just incase which is 68/64/60 off ebay, just cut 4 slits in it and joined the two perfectly. Hope this thread may help someone in the future  :smiley: